Acoustic Cleaning of Baghouse with Sonic Horn
Baghouse dust collector is featured with high filtration efficiency and immune to electrical resistivity of dusts. Wide adaptability to high temperature & humidity & concentration dust, hygroscopic dust, flammable & explosive dust makes it used in more and more applications.
Baghouse cleaning is vital to keep its performance. In practice, hopper outlet can be clogged due to bridging and arching. Manual cleaning is required at regular frequency.
Sonic horn specially designed for baghouse is used to clean dust deposit, reduce pressure drop, extend bag service life, and prevent buildup and caking on hopper walls to avoid blockage.
How Sonic Horn Cleans Baghouse
Baghouse hopper is normally in cone or pyramid shape. Dust deposits flow downwards by gravity. Flow section gets smaller in the moving down, while friction between dusts and hopper wall grows bigger. Buildup occurs on hopper wall and causes clogging.
Via vibration of Titanium diaphragm, sonic horn utilizes compressed air as power source to generate sound wave. PLC control system receives analog signal of differential pressure from site and send on/off signal to apply alternating sound pressure to dust layer accumulated on filter bags or hopper. Low frequency, high intensity sound wave will break adhesion of dust particles. Dusts fall off from fabric bags, baghouse is renewed to keep optimal filtration performance.
Sonic Horn Sound Wave Transmission & Frequency & Intensity
In the air, longitudinal sound wave generated by diaphragm propagates in semi-spherical shape.
Wave length is inversely proportional to sound frequency. Higher frequency means shorter wave length and faster attenuation. Acoustic energy applied to dust particles in unit time is lower, and cleaning performance is worse. On the contrary, sound frequency is lower, cleaning is better. Normally, wave length by sonic horn is above 1 meter.
Sound intensity is proportional to pressure of compressed air. Higher pressure of compressed air means bigger amplitude of diaphragm. Sound intensity is higher, cleaning performance is better. When it is higher than 135~137dB, sound wave starts to take effect in deposit removal. Normally sound intensity is 140~150dB, and operational pressure is 0.3~0.7MPa.
Benefits
- Improved performance to work together with reverse air or pulse jet cleaning.
- 360-degree Coverage. Omnidirectional nature of sound waves allows for full-area coverage, even some areas behind obstacle.
- Non-destructive cleaning, no damage to filter bag.
- Reduce pressure drop of baghouse.
- Avoid bridging and clogging in hopper.
- Low maintenance, low cost.
